Jupiter‘s fourth moon, Callisto—once the location of humanity’s most advanced research base. One day, “Zion Frontier,” as it was called, was struck by a mysterious explosion. One year later, the fractured remains of the base are recovered by a manned ship called “Altair.” Among the remains was a frozen capsule containing the body of genius space engineer Zion Miller, and the android Flem nestled beside the capsule. And then there was Hope, the extraterrestrial life-form discovered in the Jupiter space. A mysterious incident involving them and the crew soon occurs on-board the ship. Was this incident caused by the mysterious life-form? Or by the crew? With no means of escape, fear and suspicion spread throughout the ship…

Jupiter‘s fourth moon, Callisto—once the location of humanity’s most advanced research base. One day, “Zion Frontier,” as it was called, was struck by a mysterious explosion. One year later, the fractured remains of the base are recovered by a manned ship called “Altair.” Among the remains was a frozen capsule containing the body of genius space engineer Zion Miller, and the android Flem nestled beside the capsule. And then there was Hope, the extraterrestrial life-form discovered in the Jupiter space. A mysterious incident involving them and the crew soon occurs on-board the ship. Was this incident caused by the mysterious life-form? Or by the crew? With no means of escape, fear and suspicion spread throughout the ship…